your best single source for
PARR PELLET PRESS
STABLE ISOTOPES Now in o n e p r i c e list Bio-Rad offers: NMR
solvents
N-15
gas and c o m p o u n d s
0 - 1 7 I water, gas 0 - 1 8 I and c o m p o u n d s HEAVY WATER DEUTERIUM GAS S e n d for the c u r r e n t c a t a l o g a n d p r i c e list. Circle No. 96 on Readers' Service Card
The Quick and Easy Way to Make PELLETS, TABLETS and WAFERS
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Bio-Rad Laboratories, 32 & Griffin Avenues, Richmond, Calif. Gentlemen: Please rush me your current catalog and price list of stable isotopes. NAME
TITLE
Pellets or tablets for calorimetry, pharmaceutical research, spectres* copy, nutritional experiments and many other laboratory purposes can be produced quickly and easily in a Parr pellet press. This portable, hand-operated press develops forces in excess of 5 0 0 0 psi. for making firm pellets in a n y of six different diameters:
Mx"
ORGANIZATION
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W
W
.178"
.118"
Ask for Specification- 2811
ADDRESS CITY
STATE
ZIP
PARR INSTRUMENT 211 Fifty-Third St.
COMPANY Moline, Illinois
Circle No. 68 on Readers' Service Card
purified ion exchange resins for laboratory use
A TRUE QUANTITATIVE
SPECTRODENSITOMETER
Bio-Rad A G * and Bio-Rex* ion exchange resins are specially prepared for laboratory use — analytical, clinical and research. Using a unique purification process Bio-Rad reduces the organic and inorganic contaminants in these resins to a level that makes them perfectly suitable for laboratory use without further processing. Then special sizing techniques are used to give AG and Bio-Rex resins extremely narrow particle size distribution. High purity and narrow particle distribution result in sharper column separations and reduced band spreading. For c o m p l e t e details, i n c l u d i n g p r i c i n g , send for the current ion e x c h a n g e c a t a l o g a n d price list.
A NEW RATIO RECORDING DOUBLE BEAM S C A N N I N G SPECTRODENSITOMETER
Circle No. 97 on Readers' Service Card
For T h i n Layer — Paper — Gel and C o l u m n Chromatography as well as many other applications. Dept. A-32
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Bio-Rad Laboratories, 32 & Griffin Avenues, Richmond, Calif. Gentlemen: Please send me your current catalog and price list of ion exchange resins.
The Most Versatile Instrument Ever Instrument comes complete with Xenon Lamp and Quartz Monochromator ( 2 0 0 - 7 0 0 mu). For literature contact:
NAME
TITLE
SI / tHOEFFEL N S T R U M E N T -en.
ORGANIZATION ADDRESS CITY
STATE
ZIP
15 Douglas Street, Westwood, N . J. Phone: (201) 6 6 4 - 7 2 6 3
Circle No. 178 on Readers' Service Card
134 A
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ANALYTICAL CHEMISTRY
